Log on to the computer as a member of the RTCUniversalServerAdmins group, or as a member of the Cs-ServerAdministrator or CsAdministrator role.

Start the Lync Server Management Shell: Click Start, click All Programs, click Microsoft Lync Server 2013, and then click Lync Server Management Shell.

Run the following at the command prompt:

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Get-CsDialinConferencingConfiguration

This cmdlet retrieves information about whether participants are required to record their name when joining a conference and how Lync Server responds when participants join or leave a dial-in conference.

Run the following at the command prompt:

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Set-CsDialinConferencingConfiguration -Identity <identity of dial-in conferencing settings to be modified> [-EnableNameRecording <$true | $false>] [-EntryExitAnnouncementsEnabledByDefault <$true | $false>] [-EntryExitAnnouncementsType <UseNames | ToneOnly]

EnableNameRecording   Determines whether anonymous participants are asked to record their name before entering the conference. The default value is "$true," which means that anonymous participants are prompted to state their name when joining a conference. (Authenticated participants do not record their name because their display name is used instead.)

EntryExitAnnouncementsEnabledByDefault   Indicates whether announcements are turned on or off by default. The default value is "$false," which means that by default there are no announcements when participants join or leave a conference. The meeting organizer can override this setting when scheduling a meeting.

EntryExitAnnouncementsType   Indicates the action taken whenever a participant joins or leaves a conference for which announcements are enabled. The default value is "UseNames," which means there is an announcement similar to the following: "Ken Myer has joined the conference" when announcements are turned on.

You can configure these settings at the global scope or at the site scope. Settings configured at the site scope take precedence over settings configured at the global scope.

For example:

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Set-CsDialinConferencingConfiguration -Identity site:Redmond -EnableNameRecording $false -EntryExitAnnouncementsEnabledByDefault $true -EntryExitAnnouncementsType ToneOnly

In this example, settings are configured at the site scope for Redmond. Announcements are turned on, but participants are not prompted to say their name when they join a conference. A tone is played when participants enter or leave a conference.